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Employee Benefit Plans - Arrow SERP and Wyle Defined Benefit Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation $ 100,825 $ 93,385  
Defined Benefit Plan, Benefit Obligation 109,556 101,817 $ 90,578
Defined Benefit Plan, Service Cost 3,514 2,874  
Defined Benefit Plan, Interest Cost 3,087 3,710  
Defined Benefit Plan, Benefit Obligation, Actuarial (Gain) Loss 5,699 9,210  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (4,561) (4,555)  
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 0 0  
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 0 0  
Defined Benefit Plan, Plan Assets, Benefits Paid 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (109,556) (101,817)  
Assets for Plan Benefits, Defined Benefit Plan 0 0  
Liability, Defined Benefit Plan, Current (4,532) (4,535)  
Liability, Defined Benefit Plan, Noncurrent (105,024) (97,282)  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0  
Defined Benefit Plan, Amortization of Gain (Loss) (1,606) (100)  
Settlement charge 0 0  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 8,207 $ 6,684  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.40% 3.10%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 5.00% 5.00%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.10% 4.20%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 5.00% 5.00%  
Defined Benefit Plan, Expected Future Benefit Payments in Year One $ 4,532    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 6,071    
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 6,380    
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 6,551    
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 6,461    
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 34,019    
Wyle Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accumulated Benefit Obligation 0 $ 0  
Defined Benefit Plan, Benefit Obligation 0 0 59,399
Defined Benefit Plan, Service Cost 0 0  
Defined Benefit Plan, Interest Cost 0 1,130  
Defined Benefit Plan, Benefit Obligation, Actuarial (Gain) Loss 0 1,500  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 0 (2,718)  
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 0 (59,311)  
Defined Benefit Plan, Plan Assets, Amount 0 502 $ 54,925
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 7,606  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan (502)    
Defined Benefit Plan, Plan Assets, Contributions by Employer   0  
Defined Benefit Plan, Plan Assets, Benefits Paid 0 (2,718)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 (59,311)  
Defined Benefit Plan, Funded (Unfunded) Status of Plan 0 502  
Assets for Plan Benefits, Defined Benefit Plan 0 502  
Liability, Defined Benefit Plan, Current 0 0  
Liability, Defined Benefit Plan, Noncurrent 0 0  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 (954)  
Defined Benefit Plan, Amortization of Gain (Loss) 0 (820)  
Settlement charge 0 20,111  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 0 $ 21,107  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate   2.60%